Given the light story my thought is it's time to get out the canned air and do the bi-monthly maintenance.
For the last week, we've been having a problem -- not sure what is causing it at all.
The PC, running XP, will crash out of nowhere, often more than once a day (usually toward the end of the day, but sometimes earlier on as well), turning itself off completely. It then will stay off for about 60 seconds, never longer, never shorter. If you press the power button to try to restart it within those 60 seconds, it will start turning on for about two-three seconds, then shut off again. But after about a minute, it will allow itself to start up fully.
There were no warning signs prior to this happening. Today it's been happening all day. Tried CCleaner, hasn't helped. Any ideas?